Simple ebike 'fuel gauge'

[yopappamon]

What, no pics of the sacrificial victims, showing their cratered epoxy housings?

There was no excitement, no magic smoke, just wouldn't download once I got it on the right voltage.

I got no change in the fuel level and no current reading on my first ride. I'll switch the shunt leads and see if that's the problem.

[magudaman]

Well I got my software all figured out and the board into a box. My setup is self contained from the controller and would be mounted on the handle bars and just tied to battery voltage and my current hall sensor. The final specs around 30 - 110v, 200a, with a 30ah maximum. Here are a couple photos of the almost finished case, I really wish I would have waited to just make the slot on the mill but I wanted it working NOW

Ps that is a watts up with my current sensor on the line for testing.

[otas]

Hi Magudaman, nice job, shame about the slot. What about drilling individual holes, if no mill is at hand?

otto

[Jeremy Harris]

A technique I've used to make waterproof "windows" for displays, and cover up mishapen cut outs, is to draw a front panel in black with a drawing or CAD programme, leave a white bloc the exact shape you want for a display window, then print it on to a bit of ordinary paper. Next, trim the paper to size and cut out the white block with a very sharp craft knife. Finally, laminate the cut out bit of paper usign a cheap plastic film laminator. This gives you a front panel with a clear window in it that you can just glue on to the box.

Jeremy

[yopappamon]

I swapped the shunt wires and I see the meter move. Yay! I just finished mounting my new MAC hub. Looked over and saw my rim liners setting there. Oops, crap. Oh, well. Too late now. Hope the rhyno rim is smooth enough to not matter.

Off for a test ride.

Thanks for the design, Jeremy!

[spinningmagnets]

Just saw one of these at the LBS. I think it was $6, aluminum, intended to mount a standard drink "bottle cage" onto the handlebars. One thing I like about it, is that it can be attached without removing the grips or any other thing from the handlebars. If its too tall, you can easily cut off one of its ears (I dub thee, the "Van Gogh" mount), $4 plus tax & shipping:

http://yhst-84224226242177.stores.yahoo.net/vohatowaboca.html

[kfong]

All this crappy weather lately has brought me indoors as well as the need to finish 2 scooters I had promised my nieces. I really like the simple meter Jeremy had found and decided that was the perfect meter for the razor e300 scooters. I wanted something simple enough for them to follow without numbers. I decided to use pics, since I have a whole development platform for it. I will use a smaller pic for the final layout as well as incorporate a low voltage cutoff circuit.

Currently it’s working fine on my desk, just working out features to add. This meter worked out well for this project.

[dhabicht1]

Jeremy,

I love your "fuel gauge" it is exactly what I was looking for. Do you sell these at all? I have tried to search online in the forums but have not been able to find one. Please let me know what the cost is and I could send you payment via PayPal.

Thanks,

Doug

[marty]

Doug,
Jeremy took some time off from bicycle stuff so he could have move time to build a new house for him self. His last post was Sun Dec 25, 2011

Why don't you build a Simple ebike 'fuel gauge' ? and I will buy one from you.

[dhabicht1]

Thanks for the info Marty, where are you from in Buffalo? I live in FL now but grew up In Alden